Angels?

I wonder why and when people got the idea that angels are ladies in white dresses who sit on clouds and play harps.

Of course white symbolizes purity and in ancient times men wore robes, which are sort of like long dresses. And I guess back when people thought the Earth was flat it was logical to think Heaven was in the sky just above the clouds.

Some people might have thought harps were the most beautiful instrument of those available back then.

But they must have known the Bible described angels as mighty warriors who frightened people when they appeared. They certainly weren’t pretty ladies.

And cherubim, otherwise called cherubs, were certainly not cute little babies.

Can anyone tell me where those ideas originated?